Posted: 14/07/2014 at 22:18
Hi Bethany - I've grown several avocado stones into quite large plants in the past - I did the same as you with cocktail sticks and a milk bottle. When it gets to the stage yours has reached I put it into a pot of very damp compost, with the top half of the stone sticking out of the compost. Keep it really damp to start with but when the plant begins to grow more and more roots let it get a little bit drier.
Keep it indoors on a bright windowsill but out of direct sunlight. Sometimes the leaves will get brown patches or edges - this is because we just cannot reproduce the tropical humidity they need - it might be a good idea to get a hand spray and mist it in the summer.
I have heard of a large one growing outside in a very sheltered garden in London